In what could be the world's biggest-ever initial public offering, state-owned oil giant Saudi Aramco has set a preliminary valuation of $1.7 trillion.

That figure is below the $2 trillion Saudi Crown Prince Mohammed bin Salman initially wanted it valued as.

Analysts say that the global demand for oil is set to taper off in the next four years.

Al Jazeera's Abid Ali explains why.

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